CN112064491A - Vibration damping device, vibration damping method and large-span bridge - Google Patents
Vibration damping device, vibration damping method and large-span bridge Download PDFInfo
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- CN112064491A CN112064491A CN202010826922.3A CN202010826922A CN112064491A CN 112064491 A CN112064491 A CN 112064491A CN 202010826922 A CN202010826922 A CN 202010826922A CN 112064491 A CN112064491 A CN 112064491A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention relates to the technical field of bridge vibration reduction, and discloses a vibration reduction device, a vibration reduction method and a large-span bridge, wherein the large-span bridge comprises: the bridge comprises a plurality of piers arranged at intervals, wherein each pier is provided with a cross beam; the main beams are arranged on all the cross beams; and a vibration damping device or two vibration damping devices which are symmetrically arranged are arranged at each pier. Each girder damping device includes: one end of the dowel bar is rotatably connected with the bottom of the main beam outside the pier; the middle part of the amplification rod can be rotatably arranged on the cross beam or the pier and comprises a connecting end and an amplification end, and the connecting end is rotatably connected with the other end of the dowel bar; the device also comprises a damper, one end of the damper can be arranged on the cross beam or the pier in a relatively rotating mode, and the other end of the damper is connected with the amplifying end in a rotating mode. The vibration damping device can solve the problems of wind vibration and vehicle vibration including vortex vibration generated by a large-span bridge at a specific wind speed in the prior art.
Description
Technical Field
The invention relates to the technical field of bridge vibration reduction, in particular to a vibration reduction device, a vibration reduction method and a large-span bridge.
Background
In recent years, with the development of large-span bridges, various cable bearing bridges with ultra-large spans are continuously developed. Due to the increase of the span, the vertical bending and torsion fundamental frequencies of the bridges are obviously reduced, and vortex-induced vibration is easier to excite in a lower wind speed range. On the other hand, these bridges are mostly made of low damping steel structures, which further increases the possibility of vortex-induced vibration. For example, the main beam of the Changjiang river bridge in the parrot continent has continuous vertical large-amplitude vortex-induced vibration, the maximum amplitude of the main beam reaches 0.55m and the vibration frequency is 0.24Hz through monitoring and analysis, and the actually measured site average wind speed is only 7.2m/s (4-level wind). Similar vertical large-amplitude vortex-induced vibration also appears in the main beam of the Tiger-gate bridge, and the maximum amplitude of the main beam reaches 0.45m and the vibration frequency is 0.38Hz through monitoring and analysis. The amplitude of the Great beat East Bridges vertical vortex oscillations in denmark is large enough to affect the bridge going. Brazilian Rio-Nitroii Bridge is turned off because of the strong vertical bending vortex oscillations that occur at wind speeds around 14 m/s. More seriously, the small amplitude vortex vibration of the main beam sometimes excites the large amplitude vibration of the ultra-long cable, and for example, the vibration amplitude of the stay cable excited by the vortex vibration of the main beam is possibly more than 1m found in the wind resistance research of the sutong changjiang bridge, which poses a new threat to the safety of the bridge.
Since the wind speed range of the vortex vibration is generally lower than the designed wind speed of the bridge, the wind-induced vibration is one of the easiest modes of bridge wind-induced vibration, and almost all blunt section large-span bridges have the potential of generating the vortex vibration. Vortex vibration not only can cause fatigue damage to a steel structure, but also can reduce the driving comfort degree and even endanger the traffic safety. For the wind-induced vortex-induced vibration of the girder of the large-span bridge with a large span, the large-span girder has the characteristics of low main frequency, dense frequency, large amplitude of the span center of the girder and small amplitude of the tower end, the contradiction between the low rigidity of the spring and the gravity of the balance mass block is difficult to deal with by the common tuned damper, the problem of tuning frequency sensitivity exists, the bridge bearing capacity is influenced to a certain extent by installing a large number of tuned dampers, and the cost is high. And the vertical damper is arranged at the lower end of the main beam, and a special supporting member needs to be additionally arranged, for example, a pier support is additionally arranged in the midspan or a very long supporting bracket is extended out of the bridge tower, so that the construction cost is high, and the influence on the whole structure and navigation is large. In addition, other wind and vehicle vibration problems, including vortex vibration, also cause comfort and safety problems for the bridge.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a vibration damping device, a vibration damping method and a large-span bridge, which can solve the problems of wind vibration and vehicle vibration of the large-span bridge including vortex vibration in the prior art.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
in one aspect, the present invention provides a vibration damping device comprising:
one end of the dowel bar is used for being rotationally connected with the piece to be damped;
the middle part of the amplification rod can be rotatably arranged and comprises a connecting end and an amplification end, the connecting end is rotatably connected with the other end of the dowel bar, and the distance from a rotating point of the amplification rod to the connecting end is less than the distance from the rotating point to the amplification end;
one end of the damper is rotatably arranged, and the other end of the damper is rotatably connected with the amplifying end.
On the basis of the technical scheme, the amplifying rod is linear, and the damper and the amplifying rod are perpendicular to each other.
On the basis of the technical scheme, the amplifying rod is L-shaped.
On the basis of the technical scheme, the part from the rotating point of the amplifying rod to the amplifying end is perpendicular to the damper.
On the basis of the technical scheme, the dowel bar is connected with the part to be damped through a spherical hinge A; the amplifying end is connected with the dowel bar through a spherical hinge B; the middle part of the amplifying rod is rotatably arranged through a spherical hinge C; the amplifying end is connected with the damper through a spherical hinge D, and one end of the damper is rotatably arranged through a spherical hinge E.
In another aspect, the present invention further provides a vibration damping method, including the steps of:
one end of a dowel bar is rotatably connected with a piece to be damped;
a rotating device is arranged in the middle of the amplifying rod, and the connecting end of the amplifying rod is rotatably connected with the other end of the dowel bar;
one end of the damper is arranged on the rotating device, and the other end of the damper is rotationally connected with the amplifying end of the amplifying rod;
and the vibration displacement of the to-be-damped part amplified by the amplifying rod is damped by the damper.
In another aspect, the present invention further provides a large-span bridge, including:
the bridge comprises a plurality of piers arranged at intervals, wherein a cross beam is arranged on each pier;
the main beams are arranged on all the cross beams;
every pier department is equipped with the vibration damper that a vibration damper or two symmetries set up, every girder vibration damper includes:
a dowel bar, one end of which is rotatably connected to the bottom of the main beam outside the pier;
-an amplification bar rotatably arranged in the middle on the girder or pier, comprising a connection end and an amplification end, the connection end being rotatably connected to the other end of the dowel and the distance from the rotation point of the amplification bar to the connection end being smaller than the distance to the amplification end;
-a damper, which is relatively rotatably arranged at one end on a beam or pier and which is rotatably connected at the other end to said enlarged end.
On the basis of the technical scheme, the amplifying rod is linear, the middle part of the amplifying rod is used for being rotatably arranged at the end part of the cross beam, one end of the damper is used for being arranged in the middle part of the cross beam, and the other end of the damper is rotatably connected with the other end of the amplifying rod.
On the basis of the technical scheme, the amplifying rod is L-shaped, the rotating point of the amplifying rod is used for being rotatably arranged on the cross beam, one end of the damper is used for being arranged on the bridge pier, and the other end of the damper is rotatably connected with the amplifying end.
On the basis of the technical scheme, the dowel bar is connected with the main beam through a spherical hinge A; the connecting end is connected with the dowel bar through a spherical hinge B; the middle part of the amplifying rod is connected with the cross beam through a spherical hinge C; the amplifying end is connected with the damper through a spherical hinge D, and the damper is arranged on the cross beam or the pier through a spherical hinge E.
Compared with the prior art, the invention has the advantages that: the invention provides a vibration damping device based on a lever amplification principle, wherein one end of a dowel bar is rotatably connected with a to-be-damped piece, the other end of the dowel bar is rotatably connected with a connecting end of an amplification bar, the amplification end of the amplification bar is rotatably connected with a damper, the middle part of the amplification bar and the other end of the damper are rotatably arranged, the distance from a rotating point of the amplification bar to the connecting end is smaller than the distance to the amplification end, and the micro vibration of the to-be-damped piece can be amplified to the amplification end of the amplification bar through the dowel bar and the amplification bar. The ratio of the distance L1 from the rotating point to the amplifying end to the distance L2 from the rotating point to the connecting end is adjusted to set the times of vibration amplification required by the structure, the amplification factor is L1/L2, and the amplitude of the up-and-down vibration of the far end of the main beam is obtained by adjusting the extending length L3 of the rigid inclined rod AB along the direction of the main beam. When the device is applied to a bridge, the vertical displacement of the main beam near the bridge tower is amplified and transmitted to the damper by installing the damper and the lever amplifying device on a bridge tower cross beam or an existing bridge pier, so that special support member arrangement is omitted, a good vibration attenuation effect is achieved, and the manufacturing cost can be obviously reduced. The vibration damper can be adapted to the longitudinal displacement of a bridge caused by temperature stress and vehicle braking, and a longitudinal displacement adapting device does not need to be additionally arranged for a damper.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a vibration damping device according to a first embodiment and a second embodiment of the present invention;
FIG. 2 is a schematic diagram of a vertical damping of a damping device according to one or two embodiments of the present invention;
FIG. 3 is a schematic diagram of the longitudinal damping of the damping device in the first and second embodiments of the present invention
FIG. 4 is a schematic structural view of a damping device according to a third embodiment of the present invention;
FIG. 5 is a schematic view of a vertical damping of a damping device according to a third embodiment of the present invention;
FIG. 6 is a longitudinal vibration damping diagram of a vibration damping device according to a third embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a six and seven mid-span bridge according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an eighth medium-large span bridge according to an embodiment of the present invention.
In the figure: 1. a dowel bar; 2. a main beam; 3. enlarging the rod; 4. a cross beam; 5. a damper; 6. Provided is a bridge pier.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Example one
As shown in fig. 1, the present invention provides a vibration damping device including: one end of the dowel bar 1 is used for being rotationally connected with a piece to be damped; the middle part of the amplification rod 3 is rotatably arranged and comprises a connecting end and an amplification end, the connecting end is rotatably connected with the other end of the dowel bar 1, and the distance from a rotating point of the amplification rod 3 to the connecting end is less than the distance from the rotating point to the amplification end; and the other end of the damper 5 is rotatably connected with the other end of the amplifying rod 3.
When the vibration damping device is used, one end of the dowel bar 1 is rotatably connected with a to-be-damped piece, the other end of the dowel bar is rotatably connected with the connecting end of the amplifying bar 3, the amplifying end of the amplifying bar 3 is rotatably connected with the damper 5, the middle part of the amplifying bar 3 and the other end of the damper 5 can be rotatably arranged, the distance from the rotating point of the amplifying bar 3 to the connecting end is smaller than the distance to the amplifying end, and the to-be-damped piece can be slightly vibrated to the amplifying end of the amplifying bar 3 through the amplification of the dowel bar 1 and the amplifying bar 3. The ratio of the distance L1 from the rotating point to the amplifying end to the distance L2 from the rotating point to the connecting end is adjusted to set the times of vibration amplification required by the structure, the amplification factor is L1/L2, and the amplitude of the up-and-down vibration of the far end of the main beam is obtained by adjusting the extending length L3 of the dowel bar 1 in the direction of the main beam.
In this embodiment, this scheme can be applied to on the girder of bridge, also can be applied to on the lid of industrial factory building, airport, high-speed railway station and stadium. Taking a main beam applied to a bridge as an example, when the bridge is used, one end of the dowel bar 1 is rotatably connected with the bottom of the main beam 2 outside a pier 6. When the main beam 2 vibrates, the vibration amplitude of the main beam 2 positioned outside the bridge pier is larger than that of the bridge pier, the main beam is easier to transmit outwards, the main beam is amplified by the amplifying rod 3 and transmitted to the damper 5, and the vortex-induced vibration of the large-span bridge can be controlled more effectively.
Similarly, when the device is used on the cover bodies of industrial plants, airports, high-speed railway stations and stadiums, one end of the dowel bar 1 is rotatably connected to the outer side of the fixed support, so that the device can better play a role.
As shown in fig. 2 and 3, in the present embodiment, the vibration damping device mounted on the main beam of the bridge is taken as an example, and the amplification principle is as follows:
(1) vertical displacement amplification factor calculation
As shown in fig. 2, the rotation connection point of the dowel bar and the member to be damped is point a, point a ' is after vertical displacement, the connection end of the amplification bar 3 is point B, point B ' is after vertical displacement, the rotation point of the amplification bar 3 is point C, the amplification end of the amplification bar 3 is point D, and the rotation setting point of the damper 5 which is point D ' is point E after vertical displacement. Then the vertical micro displacement AA 'is released from the point A at the bottom of the main beam, the force transmission rod 1 translates vertically, the vertical translation BB' is generated at the point B at the connecting end, AA '═ BB', and the amplification factor n ═ DD '/BB' ═ CD/CB according to the similarity between the point delta BCB 'and the point delta DCD'.
(2) Longitudinal displacement amplification factor calculation
As shown in fig. 3, the rotation connection point of the dowel bar and the member to be damped is point a, point a "is after the transverse displacement, the connection end of the amplification bar 3 is point B, point B" is after the transverse displacement, the rotation point of the amplification bar 3 is point C, the amplification end of the amplification bar 3 is point D, and the rotation setting point of the damper 5 which is point D "is point E after the transverse displacement. a is the vertical projection length of the AB line segment, b is the horizontal projection length of the AB line segment, AA 'u, BB' v.
According to the right triangle relationship, (a-u)2+(b+v)2＝a2+b2Available as-2 au + u2+2bv+v2Since the vertical minor deformation of the main beam at the tower end is 0, u and v are small relative to a and b, and are approximately 0, it can be obtained
Therefore, the amplification factor n is CD/CB & cot & A' AB.
Example two
Referring again to fig. 1, in the first embodiment, the enlargement bar 3 is linear. In the embodiment, taking a vibration damping device installed on a main beam of a bridge as an example, when the clearance between the main beam 2 and the cross beam 4 meets the vertical installation requirement of the damper 5, the rotation point of the amplifying rod 3 is arranged at the end part of the cross beam 4, and the damper 5 is arranged in the middle of the cross beam. Such setting up easy operation is convenient, need not increase extra auxiliary device and can accomplish the installation to can not influence the navigation headroom under the girder 2.
In some alternative embodiments, the damper 5 and the amplification bar 3 are arranged perpendicular to each other. In the present embodiment, the damper 5 and the amplification rod 3 are disposed perpendicular to each other, and the displacement of the amplification end of the amplification rod 3 is transmitted to the damper 5 to the maximum extent, so that the damper 5 acts.
EXAMPLE III
As shown in fig. 4 to 6, the enlargement bar 3 is L-shaped based on the first embodiment. In this embodiment, taking a vibration damping device installed on a main beam of a bridge as an example, when a clearance between the main beam 2 and the cross beam 4 does not meet a vertical installation requirement of the damper 5, a bracket is additionally arranged on the cross beam 4 for setting a rotation point of the amplification rod 3, and the damper 5 is arranged on a pier 6. Such setting can also realize the device of this scheme of installation when the headroom between girder 2 and crossbeam 4 does not satisfy the requirement to the navigation headroom under girder 2 can not be influenced basically.
In some alternative embodiments, the portion from the rotation point to the enlargement end of the enlargement lever 3 and the damper 5 are arranged perpendicular to each other. In the present embodiment, the damper 5 is disposed perpendicular to the portion from the rotation point to the amplification end of the amplification lever 3, and the displacement of the amplification end of the amplification lever 3 is transmitted to the damper 5 to the maximum extent, so that the damper 5 acts.
Example four
On the basis of the first, second or third embodiment, the dowel bar 1 is connected with the part to be damped through a spherical hinge A; the amplifying end is connected with the dowel bar 1 through a spherical hinge B; the middle part of the amplifying rod 3 is rotatably arranged through a spherical hinge C; the amplifying end is connected with the damper 5 through a spherical hinge D, and one end of the damper 5 can rotate and is arranged through a spherical hinge E. In this embodiment, each rotation point is implemented by using a spherical hinge, but in other embodiments, other rotation connection manners may be used.
In the first, second, third and fourth embodiments, the vibration damping device can give consideration to the control of the longitudinal displacement of the member to be damped, can adapt to the longitudinal displacement of the member to be damped caused by the temperature load, has the function of simultaneously controlling the longitudinal and vertical displacements of the member to be damped, and has the displacement amplification effect. The damper 5 may be an oil damper, a magnetorheological damper, an eddy current damper, or the like.
EXAMPLE five
The invention also provides a vibration reduction method, which comprises the following steps:
s1: one end of a dowel bar 1 is rotatably connected with a piece to be damped;
s2: a rotating device is arranged in the middle of the amplifying rod 3, and the connecting end of the amplifying rod 3 is rotatably connected with the other end of the dowel bar 1;
s3: one end of the damper 5 is arranged on the rotating device, and the other end of the damper 5 is rotatably connected with the amplifying end of the amplifying rod 3;
s4: the vibration displacement of the to-be-damped member amplified by the amplifying rod 3 is damped by the damper 5.
Since the distance from the pivot point of the amplification lever 3 to the connection end is smaller than the distance to the amplification end, the minute vibration of the member to be damped can be amplified to the amplification end of the amplification lever 3 by the dowel bar 1 and the amplification lever 3. The ratio of the distance L1 from the rotating point to the amplifying end to the distance L2 from the rotating point to the connecting end is adjusted to set the times of vibration amplification required by the structure, the amplification factor is L1/L2, and the amplitude of the up-and-down vibration of the far end of the main beam is obtained by adjusting the extending length L3 of the dowel bar 1 in the direction of the main beam.
In the present embodiment, the steps S1, S2 and S3 are not limited in sequence, and may be adjusted as needed to achieve the same effect.
EXAMPLE six
As shown in fig. 7 and 8, the present invention also provides a large-span bridge, including: the bridge pier structure comprises a plurality of bridge piers 6 arranged at intervals, wherein a cross beam 4 is arranged on each bridge pier 6; the device also comprises a main beam 2 which is arranged on all the cross beams 4; and a vibration damping device or two vibration damping devices which are symmetrically arranged are arranged at each pier 6.
Each girder damping device includes: one end of the dowel bar 1 is rotatably connected with the bottom of the main beam 2 outside the pier 6; the middle part of the amplification rod 3 is rotatably arranged on the cross beam 4 or the pier 6 and comprises a connecting end and an amplification end, the connecting end is rotatably connected with the other end of the dowel bar 1, and the distance from a rotating point arranged on the amplification rod 3 to the connecting end is smaller than the distance from the rotating point to the amplification end; the device also comprises a damper 5, one end of which is arranged on the beam 4 or the pier 6 in a relatively rotating way, and the other end of which is connected with the amplifying end in a rotating way.
One end of the dowel bar 1 is rotatably connected with the bottom of the main beam 2 outside the pier 6. The other end is connected with the connecting end of the amplifying rod 3 in a rotating mode, the amplifying end of the amplifying rod 3 is connected with the damper 5 in a rotating mode, the middle of the amplifying rod 3 and the other end of the damper 5 are arranged in a rotating mode, the distance from the rotating point of the amplifying rod 3 to the connecting end is smaller than the distance to the amplifying end, and the micro vibration of the to-be-damped piece can be amplified to the amplifying end of the amplifying rod 3 through the dowel bar 1 and the amplifying rod 3. The ratio of the distance L1 from the rotating point to the amplifying end to the distance L2 from the rotating point to the connecting end is adjusted to set the times of vibration amplification required by the structure, the amplification factor is L1/L2, and the amplitude of the up-and-down vibration of the far end of the main beam is obtained by adjusting the extending length L3 of the rigid inclined rod AB along the direction of the main beam. When the girder 2 vibrates, the vibration amplitude of the girder 2 outside the pier 6 is larger than that of the pier 6, so that the girder is easier to transmit outwards, is amplified by the amplifying rod 3 and is transmitted to the damper 5, and the vortex-induced vibration of the large-span bridge can be controlled more effectively. Through the form of the overhanging rigid arm, the vertical amplitude of the pier 6 outer main beam farther away can be obtained, and is effectively transmitted to the damper, so that the damping function of the damper can be better exerted.
EXAMPLE seven
On the basis of the fifth embodiment, the amplifying rod 3 is linear, the middle part of the amplifying rod is rotatably arranged at the end part of the cross beam 4, one end of the damper 5 is arranged at the middle part of the cross beam 4, and the other end of the damper is rotatably connected with the amplifying end of the amplifying rod 3. In this embodiment, when the clearance between the main beam 2 and the cross beam 4 meets the vertical installation requirement of the damper 5, the rotation point of the amplification rod 3 is arranged at the end of the cross beam 4, and the damper 5 is arranged in the middle of the cross beam. Such setting up easy operation is convenient, need not increase extra auxiliary device and can accomplish the installation to can not influence the navigation headroom under the girder 2.
Example eight
As shown in fig. 7, in the fifth embodiment, the amplification bar 3 is L-shaped, the rotation point thereof is rotatably provided on the cross beam 4, one end of the damper 5 is provided on the pier 6, and the other end thereof is rotatably connected to the amplification end of the amplification bar 3. In this embodiment, when the clearance between the main beam 2 and the cross beam 4 does not meet the vertical installation requirement of the damper 5, a bracket is additionally arranged on the cross beam 4 for setting the rotation point of the amplification rod 3, and the damper 5 is arranged on the pier 6. Such setting can also realize the device of this scheme of installation when the headroom between girder 2 and crossbeam 4 does not satisfy the requirement to the navigation headroom under girder 2 can not be influenced basically.
In some alternative embodiments, the dowel bar 1 is connected with the main beam 2 by a spherical hinge a; one end of the amplifying rod 3 is connected with the dowel bar 1 through a spherical hinge B; the middle part of the amplifying rod 3 is connected with the cross beam 4 through a spherical hinge C; the other end of the amplifying rod 3 is connected with a damper 5 through a spherical hinge D, and the damper 5 is arranged on the cross beam 4 or the pier 6 through a spherical hinge E. In this embodiment, each rotation point is implemented by using a spherical hinge, but in other embodiments, other rotation connection manners may be used.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A vibration damping device, comprising:
one end of the dowel bar (1) is used for being rotationally connected with a piece to be damped;
the middle part of the amplification rod (3) can be rotatably arranged and comprises a connecting end and an amplification end, the connecting end is rotatably connected with the other end of the dowel bar (1), and the distance from a rotating point of the amplification rod (3) to the connecting end is less than the distance to the amplification end;
and one end of the damper (5) is rotatably arranged, and the other end of the damper is rotatably connected with the amplifying end.
2. A vibration damping device according to claim 1, characterized in that said amplifying rod (3) is rectilinear; the damper (5) and the amplifying rod (3) are arranged perpendicular to each other.
3. A vibration damping device according to claim 1, characterized in that the amplification rod (3) is L-shaped.
4. A vibration damping device according to claim 3, wherein the part of the pivot point of the amplification lever (3) to the amplification end is arranged perpendicular to the damper (5).
5. Damping device according to claim 1, characterized in that the dowel (1) is connected to the part to be damped by means of a ball joint a; the amplification end is connected with the dowel bar (1) through a spherical hinge B; the middle part of the amplifying rod (3) is rotatably arranged through a spherical hinge C; the amplifying end is connected with the damper (5) through a spherical hinge D, and one end of the damper (5) can rotate and is arranged through a spherical hinge E.
6. A vibration damping method using a vibration damping device according to claim 1, characterized by comprising the steps of:
one end of a dowel bar (1) is rotatably connected with a piece to be damped;
a rotating device is arranged in the middle of the amplifying rod (3), and the connecting end of the amplifying rod (3) is rotatably connected with the other end of the dowel bar (1);
one end of the damper (5) is arranged on the rotating device, and the other end of the damper (5) is rotatably connected with the amplifying end of the amplifying rod (3);
the vibration displacement of the to-be-damped member amplified by the amplifying rod (3) is damped by the damper (5).
7. A large-span bridge provided with a vibration damping device according to claim 1, comprising:
the bridge structure comprises a plurality of bridge piers (6) arranged at intervals, wherein a cross beam (4) is arranged on each bridge pier (6);
the main beams (2) are arranged on all the cross beams (4);
every pier (6) department is equipped with the vibration damper that a vibration damper or two symmetries set up, every girder vibration damper includes:
-a dowel bar (1) with one end rotatably connected to the bottom of the main beam (2) outside the pier (6);
-an amplification bar (3) rotatably arranged in the middle on the cross beam (4) or pier (6) and comprising a connection end and an amplification end, the connection end being rotatably connected to the other end of the dowel (1) and the distance from the rotation point of the amplification bar (3) to the connection end being smaller than the distance to the amplification end;
-a damper (5) rotatably mounted on the cross beam (4) or on the abutment (6) at one end and rotatably connected to said enlarged end at the other end.
8. A large span bridge according to claim 7, wherein said amplification bar (3) is rectilinear, with its central portion adapted to be rotatably arranged at the end of said transverse beam (4), and said damper (5) has one end adapted to be arranged at the central portion of said transverse beam (4) and the other end rotatably connected to the other end of said amplification bar (3).
9. A large span bridge according to claim 7, wherein said enlarged rod (3) is L-shaped, with a pivot point for pivoting on said cross beam (4), and said damper (5) has one end for mounting on said pier (6) and the other end pivotally connected to said enlarged end.
10. A large span bridge according to claim 7, wherein said dowel (1) is connected to said main girder (2) by means of a ball joint A; the connecting end is connected with the dowel bar (1) through a spherical hinge B; the middle part of the amplifying rod (3) is connected with the cross beam (4) through a spherical hinge C; the amplification end is connected with the damper (5) through a spherical hinge D, and the damper (5) is arranged on the cross beam (4) or the pier (6) through a spherical hinge E.
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| CN202010826922.3A CN112064491A (en) | 2020-08-17 | 2020-08-17 | Vibration damping device, vibration damping method and large-span bridge |
| AU2021201707A AU2021201707A1 (en) | 2020-08-17 | 2021-03-18 | Vibration Damping Device, Vibration Damping Method and Long-Span Bridge |
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| CN202010826922.3A CN112064491A (en) | 2020-08-17 | 2020-08-17 | Vibration damping device, vibration damping method and large-span bridge |
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|---|---|---|---|---|
| CN114214923A (en) * | 2021-12-14 | 2022-03-22 | 同济大学 | Bridge damping cantilever system |
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| AU2021201707A1 (en) | 2022-03-03 |
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